Stereoscopic moving picture film printing machine



May 14, 1935. K. F. MARX STEREOSCOPIG movme PICTURE FILM PRINTING MACHINE Filed April 10, 1953 2 Sheets-Sheet 1 o 0V ///-n// 1. o QN J NV] I i O 0 R.

IN VENTOR.

at... May 14, 1935 I 2,001,280 I UNITED STATES PATENT OFFICE 2,001,280 STEBEOSCOPIC mavrg m g ma mm Karl E. mum-born, men. Application April 10, 1933, Serial No. 005,212

' Claims. (01. 05-15) This invention relates to machines for printing ferred from one to the other during the time the positive films for motion picture projection and slot 20 is moving from one to the other of openmore especially for printing stereoscopic films. lugs 21 and 20 and the positive and negative films Among the objects of the invention is the printmust be stationary relative to each other during 5 ing upon a single film of negatives prepared in the exposure.

stereoscopic cameras. This is accomplished by mounting the carriage Another object is means for printing upon a ll upon shafts "a carried upon crank arms ll single film from two negative films, of exposures and ii, which in turn are fixed to gears l2 roalternately from each of the two, which negative tatably mounted in fixed portions of base i and films may be made either in a stereoscopic camera coacting with racks i I which are movable longi- 10 or in two separate cameras properly related and tudinally through yoke l0 and crank pin 8 on disc synchronized for either simultaneous or alternat- I, the latter being fixed to shaft 4|. ing exposures. I i Rotating the crank disc I therefore will trans- Other objects will readily occur to those skilled mit through crank pin I and yoke l0 reciprocatintheart upon reference to the following descriping motion to toothed racks ll. Through the 18 tion and the accompanying drawings, in which action of said racks upon gears l2 and i2 and Figure 1 is a longitudinal sectional view of the crank arms I and IS the carriage I will swing device. 4 back and forth so that (looking at Figure l) Figure2 is a sectional view of the index mechapoint E will mov on 8 half cir le to Point 20 him on line A-B of Figure l. and point G also on a half circle to point B, 20

Figure 3 is a plan view of the shutter disc on and consequently the positive film 2| at point J line C--D oi Figure 1. under the opening 21 will move to point K under Figure 4 shows a diagrammatic plan view of a the opening 28. stereoscopic camera. Fixed to the end of one of racks II by pin 42 25 Figure 5 is a cross-sectional view on line M-N is a slide ll carrying cams II and 40 (see Fig- 25 of Figure 1, and ure 2) which coact with the teeth of an index Figure 6 is an end view with parts in-section. gear 30. The reciprocation of the slide will there- Like characters of reference are employed to fore rotate the gear 3 st p y Stepdesignate the corresponding parts. The square or splined shaft 42 slidably mount- The number I indicates the base upon which ed in cog wheel I! is driven by index gear II 30 uprights 2 and 2 are mounted to support the light through ft he latter b61118 lotatably proof case 4 with the light bulb I fastened therein.- mounted in block ll and connected to the uni- Below the light bulb the matte glass disc 38 perversal joint 34. The two seat I f r riv nfl th mits the light to pass without a glare through we wheels ll and- 46 through shafts 41 are in 35 the openinss 24 and 25 arranged opposite each mesh with index gear It. It is understood that as other in the lower part of'case I. Through a th s co s c is timed in svnchronism with drive shaft 44, motive power can be transmitted the film movement and the shutter disc 22. It from sprocket s and link chain a to sprocket :2, is prefer ed to r d a rubber d or t ead thence to miter gears II and ll and shaft 2. II on cog wheel II to insure resilient pressure 40 for the purpose of driving the shutter disc 22 in of the posit v fi 1| up n h n fl v films ll 40 synchronism with the rest of the mechanism. and 20 during the light exposures.

In its rotation the single slot 20 in the shutter It will be noted that the 8 8 d m disc 22 will'pass over the openings 2! and 2| in sizes are such as to move the negative andposiplate 22 to permit the light to strike alternately tive films at the same speed and for this reason the two negative stereoscopic films l8 and 20 alternate exposures on each negative film will 45 which are arranged to pass under the openings not be printed, but, by utilizing gearing to prop- 21 and 28 and areguided by the cog wheels 45 erly change the relative speeds of the films, all and rollers 53 and 56. Arranged below case 4 of the negatives or less than half of them may and below the negative films l9 and 20 is a posibe printed as desired.

60 tive film carriage l8, and rotatably mounted in The whole apparatus should operate in a phoso this carriage it are rollers 54 and 5! and cog tographic dark room. For an aid in explaining wheel I! for guiding and feeding the positive a stereoscopic camera 40 with two lens pieces ll m 2|, and II and focus point I2isshown inplan view In order to print upon film 2| alternately from in Figure 4.

55 the films l0 and 20, the former must be trans- Although a specific embodiment of the pres- M r is ent invention has been illustrated and described it is to be understood that various changes may he made in the details of construction without departing from the spirit of the invention as set forth in the appended claims, and such changes are contemplat What E ciain l. A printing machine for stereoscopic moving picture films comprising a light prooi case, a light source therein, two openings in said case for the passage of light therethrough, a shutter operable to uncover alternately said two openings, means for intermittently moving a negative opposite each for said openings in printing relation thereto, in synchronism with the said shutter, and means for passing a positive moving pictures film in the same direction and in printing relation with said negative films and alternately contacting with said negative films whereioyto make one exposure upon the positive film through one of the negative films and then another exposure consecutively upon the some positive film through the other negative i 2. Means for printing stereoscopic motion picture films, comprising a light-proof casing having a source of light therein and a pair of shutter controlled light passages for emission of light therefrom, means for supporting a negative film over each or said openings, a positive film carriage constructed and arranged to press said positive film against one of said negative films,

means to move said carriage from the one of said negative films to the other, actuating means for said carriage, actuating means for said shutter means and means for synchronizing the two last mentioned means to open each shutter controlled passage when the negative and positive films are in contact.

3. Means for printing stereoscopic motion pic ture films, comprising a light-proof casing', is source of light therein, and a pair of openings for passage of light therefrom, a single shutter arranged to open alternately said openings, means for supporting and intermittently moving a neg ative film over each of said openings in lighttransmitting relation thereto, a reciprocating: carriage for supporting a positive film, means on said carriage for supporting and intermittently moving said positive film and pressing said posi tive film against said negative films alternately as said light passages are respectively opened, and means for reciprocating said carriage and operating said shutter in synchronism,

4. In a printing device for a motion picture film in which alternate positives are to be printed from two negative films, means for contacting said positive film alternately with said negative films, said means comprising a. carriage for the positive film including means for moving the lat ter intermittently longitudinally, crani: mean; supporting said carriage, gears for operating sale. crank means and rack means for oscillating said gears.

5. In a printing device for a motion picture film in which alternate positives are to be printed from two negative films, a source of light, a shutter for controlling the passage of light therefrom, means for supporting a pair of negative films in position to alternately transmit the light passed by said shutter, means for supporting a positive film and contacting the latter alternately with the negative films during light passage and; means for moving intermittently all of said films longitudinally in unison and at proper relative speeds. 

